CN115030110B - Construction method for dynamically controlling VC value of roller compacted concrete under high-altitude complex environment condition - Google Patents
Construction method for dynamically controlling VC value of roller compacted concrete under high-altitude complex environment condition Download PDFInfo
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- 239000011382 roller-compacted concrete Substances 0.000 title claims abstract description 96
- 238000010276 construction Methods 0.000 title claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 32
- 230000007613 environmental effect Effects 0.000 claims abstract description 12
- 230000002829 reductive effect Effects 0.000 claims description 27
- 239000007921 spray Substances 0.000 claims description 23
- 239000003638 chemical reducing agent Substances 0.000 claims description 18
- 239000004033 plastic Substances 0.000 claims description 11
- 238000005507 spraying Methods 0.000 claims description 10
- 238000012360 testing method Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 230000002035 prolonged effect Effects 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims description 6
- 230000003203 everyday effect Effects 0.000 claims description 5
- 230000002411 adverse Effects 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000005855 radiation Effects 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 2
- 230000001276 controlling effect Effects 0.000 claims 8
- 230000001105 regulatory effect Effects 0.000 claims 1
- 239000004567 concrete Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000009407 construction method and process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000003446 ligand Substances 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B7/00—Barrages or weirs; Layout, construction, methods of, or devices for, making same
- E02B7/02—Fixed barrages
- E02B7/04—Dams across valleys
- E02B7/08—Wall dams
- E02B7/12—Arch dams
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/10—Miscellaneous comprising sensor means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention discloses a construction method for dynamically controlling VC values of roller compacted concrete under high-altitude complex environmental conditions, and belongs to the technical field of water conservancy and hydropower construction. The method comprises the following steps: s1, obtaining VC value data of environmental influence; s2, dynamically controlling the VC value of the machine outlet; s3, controlling VC value loss in transportation; s4, the bin surface controls the VC value loss. According to the influence of the climate conditions in the working condition area, a proper VC value control interval is selected; and the machine outlet, the transportation and the warehouse surface are dynamically controlled, so that the VC value of the on-site roller compacted concrete is ensured to meet the requirement.
Description
Technical Field
The invention relates to the technical field of water conservancy and hydropower construction, in particular to a roller compacted concrete VC value dynamic control construction method under high-altitude complex environment conditions.
Background
At present, the domestic roller compacted concrete dam forms a relatively mature construction process in areas with low altitude and uniform climate, and the quality control aspect is gradually perfected. After 2001, newly constructed roller compacted concrete gravity dams in China are gradually transferred to northwest areas; the method has the advantages that abundant experience is accumulated in the aspects of structural design, temperature control, concrete materials, construction methods and processes, construction machines and tools and the like of the roller compacted concrete dam in the cold region, and a batch of new technical results and theoretical research results are obtained.
In the production and construction process of roller compacted concrete, the control of VC value plays a vital role in the aspects of interlayer combination of concrete and crack resistance; the prior dynamic control of VC value is generally controlled in the concrete production process, and some engineering schemes related to the process exist, but only the single factor is considered for adjustment. In the northwest plateau area, the dynamic adjustment of the VC value from the production and construction process of the mixture is in progress under the special climatic environments of large temperature difference between dry, hot, strong wind, day and night.
Therefore, the construction method for dynamically controlling the VC value of the roller compacted concrete under the high-altitude complex environmental condition is researched by the inventor, and experience is provided for dynamically controlling the VC value of the roller compacted concrete under the similar environmental condition.
Disclosure of Invention
The invention aims to solve the problem that in the prior art, the roller compacted concrete process control under the high-altitude complex environment condition has no relevant dynamic adjustment method, and provides a construction method for dynamically controlling the VC value of the roller compacted concrete under the high-altitude complex environment condition.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the construction method for dynamically controlling the VC value of roller compacted concrete under the condition of high-altitude complex environment comprises the following steps:
s1, obtaining VC value data of environmental influence;
s2, dynamically controlling the VC value of the machine outlet;
s3, controlling VC value loss in transportation;
s4, the bin surface controls the VC value loss.
Preferably, the method further comprises:
s5, controlling the VC value under the weather effect.
Preferably, in step S1, it includes:
s101, determining climate conditions of an engineering area;
the meteorological data monitoring is carried out, and the typical climate conditions are determined by combining the air temperature, wind speed and wind direction and rainfall conditions with local meteorological data;
s102, summarizing a change curve of VC values influenced by month natural environment;
according to the roller compacted concrete VC value detection test, comprehensively considering the influence of air temperature, sunlight and rainfall, and summarizing the characteristic change curve of the VC value per month.
Preferably, in step S1, the method further includes:
s103, according to the temperature conditions of different time periods, the VC value of the roller compacted concrete on the warehouse surface is adjusted and controlled.
Preferably, in step S2:
under the condition that the mixing ratio of the roller compacted concrete is unchanged with other parameters, the VC value at the outlet of the machine is dynamically controlled by changing the mixing amount of the water reducing agent.
Preferably, in step S3:
a shielding shed is arranged on the roof of the transport dumper, and rubber-plastic sponge is arranged on baffles on two sides of a vehicle body;
the full pipe chute pipe body wraps rubber plastic sponge, and the warehousing belt conveyor is provided with a shielding shed.
Preferably, in step S4:
through the storehouse face spraying, the VC value loss when storehouse face is unloaded and rolls is reduced.
Preferably, in step S4:
and the spraying machine position is determined according to the wind direction by adopting a movable spraying mode in windy weather.
Preferably, in step S5:
the VC value of the roller compacted concrete is dynamically controlled by reducing the water consumption for mixing in rainy days.
Preferably, in step S5:
the standard of reducing the mixing water consumption in rainy days is as follows:
the rainfall intensity is less than 3mm/h, and the deduction water consumption is 0 kg/m;
the rainfall intensity is 3-6 mm/h, and the water consumption is reduced by 1-2 kg/m;
the rainfall intensity is 7-10 mm/h, and the water consumption is reduced by 2-5 kg/m.
Compared with the prior art, the invention provides the construction method for dynamically controlling the VC value of the roller compacted concrete under the condition of high altitude complex environment, which has the following beneficial effects.
1. The method overcomes the influence of special climatic environments such as dry, hot, strong wind, large day and night temperature difference and the like on the VC value of the roller compacted concrete in northwest plateau areas, and summarizes the change rule, the optimal range value and the dynamic regulation and control technical measures of the VC value of the roller compacted concrete; different VC values are adopted according to different conditions to ensure the grindability of the roller compacted concrete, so that the strength and the impermeability of the roller compacted concrete are ensured, and experience is provided for dynamic control of the VC values of the roller compacted concrete under similar environmental conditions.
2. According to the influence of the climate conditions in the working condition area, a proper VC value control interval is selected; and the machine outlet, the transportation and the warehouse surface are dynamically controlled, so that the VC value of the on-site roller compacted concrete is ensured to meet the requirement.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows; and will be apparent to those skilled in the art in part based upon a review of the following; alternatively, the teachings may be directed to practice of the present invention.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a flow chart of VC value dynamic control.
Fig. 3 is a trend graph of the air temperature distribution in the year.
Figure 4 is an average annual rainfall.
Fig. 5 shows the VC value and temperature change curve of roller compacted concrete for-4 months.
Fig. 6 is a graph of the VC value and temperature change of roller compacted concrete for-5 months.
Fig. 7 is a graph of VC value and temperature change of roller compacted concrete for-6 months.
Fig. 8 is a graph of VC value and temperature change of roller compacted concrete for-7 months.
Fig. 9 is a graph of VC value and temperature change of roller compacted concrete for-8 months.
Fig. 10 is a graph showing the VC value and temperature change of roller compacted concrete for-9 months.
Fig. 11 is a graph of VC value and temperature change of roller compacted concrete for-10 months.
Fig. 12 is the annual roller compacted concrete field VC values.
Fig. 13 is a photograph of an embodiment of a top, two-sided shade arrangement for a dump truck.
Fig. 14 is a photograph of an embodiment of a storage conveyor with a shelter.
Fig. 15 is a photograph of an example of a bin face layout spray tube.
Fig. 16 is a photograph of an example of a spray of a sprayer.
FIG. 17 is a graph showing the change of VC value with the increase of the mixing amount of the water reducing agent.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
Referring to fig. 1-17, the construction method for dynamically controlling the VC value of roller compacted concrete under the condition of high altitude complex environment comprises the following steps:
s1, obtaining VC value data of environmental influence;
s2, dynamically controlling the VC value of the machine outlet;
s3, controlling VC value loss in transportation;
s4, the bin surface controls the VC value loss.
In the method, the influence of the climate conditions of a working condition area is acquired, corresponding data are mastered, and a proper VC value control interval is selected; dynamically controlling an outlet, a transportation process and a warehouse surface, and ensuring that the VC value of the on-site roller compacted concrete meets the requirement; the construction method for dynamically controlling the VC value of the roller compacted concrete under complex environmental conditions is provided.
In step S1, the following steps are included.
S101, determining climate conditions of an engineering area;
installing a plurality of small weather stations in an engineering area, monitoring weather data every day, and recording weather conditions in time; the conditions of air temperature, wind speed, wind direction, rainfall and the like are recorded in detail, and the typical climate conditions are determined by combining the local weather data.
S102, summarizing a change curve of VC values influenced by month natural environment;
the data are tidied and analyzed by using a chart tool according to a roller compacted concrete VC value detection test; comprehensively considering the influence of air temperature, sunlight and rainfall, and summarizing the characteristic change curve of the VC value per month.
S103, according to the temperature conditions of different time periods, the VC value of the roller compacted concrete on the warehouse surface is adjusted and controlled.
For example, in a certain project, the temperature is relatively low and the humidity is relatively high in the morning and at night, and the VC value of the warehouse surface roller compacted concrete is controlled to be 1S-2S; when the temperature of the noon air is high, the VC value is controlled to be 0-1S.
As shown in fig. 3-11, the detection data in a certain project; wherein, the figures 3-4 are the air temperature distribution and rainfall information in the year; fig. 5-11 are graphs of VC values and temperature changes of roller compacted concrete for 4-10 months; the VC value dynamic control process flow is shown in figure 2.
According to the roller compacted concrete VC value detection test, data are tidied and analyzed, and the influences of transportation, air temperature, strong wind and rainfall are comprehensively considered; and (3) measuring VC values under different time periods and air temperature conditions, comparing the VC values of the outlet of each month with the VC values after field unloading, and determining various influencing factors and related technical measures.
The roller compacted concrete used in the engineering is as follows: C9015W4F50 (tertiary ligand); determining that the VC value of the mixture after unloading is required to be 0-5S according to a roller compacted concrete test; the following table shows the actual measurement of VC values and VC value loss conditions of different bin surfaces of different gases Wen Nianya in different time periods.
And the average value collected under the condition that the temperature is 4-10 months corresponds.
From the data in the table, in the engineering, under severe environments of strong sunlight, strong wind, low air pressure, large day-night temperature difference and the like which are special in northwest plateau areas, the VC values of the roller compacted concrete have larger difference in the VC value loss at different time intervals and different air temperatures every day; the VC value of roller compacted concrete is controlled by adjusting and controlling the temperature conditions of different time periods every day.
Under the conditions that the temperature is relatively low in the morning and at night, the humidity is high, and the VC value loss is low, the VC value of the warehouse surface roller compacted concrete is preferably controlled to be 1S-2S; when the temperature of the noon air is high, the loss of the VC value of the bin surface is fast, and the VC value is preferably controlled to be 0-1S under the condition that the initial setting time is short.
By dynamically controlling the VC value of the roller compacted concrete, the roller compacted concrete can be effectively ensured to have good rolling property, high plasticity and good interlayer combination in the rolling process after the paving is finished.
In step S2, the value of the output VC is dynamically controlled.
On-site mix VC value = exit VC value + process loss VC value.
After the VC value loss in the process under different climatic conditions is analyzed, the VC value at the outlet of the machine is dynamically controlled by reducing or improving the mixing amount of the water reducing agent under the condition that the mixing ratio of the roller compacted concrete is unchanged compared with other parameters, so that the purposes of changing the VC value of the roller compacted concrete and controlling the VC value loss of the roller compacted concrete on site are achieved.
For example, the VC value of the outlet is reduced by increasing the mixing amount of the water reducing agent in a high-temperature period; and specifically, the VC value is dynamically controlled according to the increase or decrease of the mixing amount of the water reducer under the working condition.
The influence of the added water reducer on the VC value and the initial setting time of the roller compacted concrete is researched by combining the special climatic environment of the plateau and the actual condition of the project, and the C9015W4F50 three-level roller compacted concrete mixing ratio actually used by the project is used for testing.
The following table is a statistical table of the change of VC value along with the addition of the water reducer; FIG. 17 is a graph showing the change of VC value with the increase of the mixing amount of the water reducing agent.
| Water reducing agent parameter (%) | 0.7 | 0.8 | 0.9 | 1.0 | 1.1 | 1.2 | 1.3 | 1.4 |
| VC value(s) | 6 | 5.2 | 4.4 | 3.6 | 2.8 | 2.0 | 1.2 | 0.4 |
Under the condition of the same air temperature, the VC value of the roller compacted concrete is reduced, so that the setting time of the roller compacted concrete can be prolonged; wherein, every time the VC value is reduced by 1S, the initial setting time of the roller compacted concrete is correspondingly prolonged by about 20min.
When the air temperature is higher than 25 ℃, the mixing amount of the water reducer is properly increased, so that the initial setting time requirement of the high-temperature weather roller compacted concrete can be met; wherein, every 0.1% of the water reducer is added, the VC value can be reduced by 0.8S, and the initial setting time is prolonged by about 30min.
In step S3, the loss of VC value is controlled during transportation.
Specifically, a shielding shed is arranged on the roof of the transport dumper, rubber plastic sponge is arranged on baffles on two sides of a vehicle body, a full-pipe chute pipe body wraps the rubber plastic sponge, and a warehouse belt conveyor is provided with the shielding shed; so as to reduce the adverse effect of external environment (sun irradiation, strong wind, etc.) on the VC value of the roller compacted concrete; the VC value of the on-site roller compacted concrete still meets the requirement after the VC value is lost in the transportation process.
In the engineering, the roller compacted concrete production system is about 6.7km away from the unloading platform, and the time from mixing, standing and receiving to the number of the bin is 18-25 min; the dam site area has long sun irradiation time and strong radiation in sunny days. After the roller compacted concrete mixture is discharged out of the mixing building, the water content is greatly evaporated, the water content is reduced, the surface is dry and white, and the VC value loss is large. As shown in fig. 13 and 14, the method of installing a shielding shed on a dump truck roof for transporting concrete, arranging rubber plastic sponge on baffles on two sides of a truck body, shielding the upper part of a warehousing belt conveyor by three-proofing cloth and wrapping rubber plastic sponge on the pipe body of a warehousing full pipe chute is adopted, so that the adverse effect caused by solar irradiation and strong wind is reduced, and the VC value loss is reduced.
| Transportation time (min) | VC value loss value(s) without protective measures | VC value loss value(s) with protective measures |
| 18 | 2.2 | 1.3 |
| 20 | 2.38 | 1.35 |
| 22 | 2.6 | 1.42 |
| 24 | 2.75 | 1.45 |
The following is statistical data of the actual detected VC value change.
It can be seen that the VC value loss value in the process is significantly reduced.
In step S4, the loss of VC value is controlled in the bin plane.
The technical measure of forming microclimate by spraying on the warehouse surface is adopted, so that the loss of the VC value of the roller compacted concrete in the process of unloading and rolling on the warehouse surface is reduced.
Wherein, the spray size is adjusted according to climate condition intelligence developments.
Specifically, as shown in fig. 15, a PVC spray pipe is arranged above the bin surface; the distance between the spray pipes is 5m and the distance between the spray pipes and the bin surface is 10m, and the single-pipe spray flow is controlled according to the air temperature condition; and the rotary spray head is used, the temperature of the bin surface is reduced through the spray flow, and the solar radiation intensity can be reduced.
The distance between the spray pipes and the bin surface are adjusted according to actual working conditions.
Specific spray flow operations are shown in the following table.
| Temperature (. Degree. C.) | VC value (S) | Spray flow (m noise/S) |
| 20~23 | 0.7s | 0.03 |
| 23~25 | 0.3s | 0.05 |
| ≥25 | 0.1s | 0.07 |
In windy weather, a movable spraying mode is mainly adopted, and the position of the sprayer is determined according to the wind direction; as shown in fig. 16, spraying was performed by using a sprayer.
In some embodiments, further comprising:
s5, controlling the VC value under the weather effect.
After the warehouse is opened, the VC value of the roller compacted concrete is dynamically controlled by reducing the water consumption for mixing in rainy days, so that the purpose of countercompensating on-site rainfall is achieved.
Once the roller compacted concrete is burned, continuous construction is required even under the condition of rainy weather, but the construction can be carried out only under a certain rainfall intensity standard. When the rainfall intensity exceeds a certain standard, the passive rainproof maintenance construction is limited according to the current construction process and quality standard.
According to the research and design of the my, under special conditions, the passive rainproof construction adopts deduction and water consumption, so that the small rain (1-3 mm/h) defined in the construction standard (DL/T5112-2021) can be relaxed to medium rain (1-10 mm/h); the VC value of the roller compacted concrete is dynamically controlled by reducing the mixing water consumption, so that the purpose of countercompensating on-site rainfall is achieved.
The water standard for deduction (namely, the water standard for mixing is reduced in rainy days) and the corresponding VC value adopted by the project are as follows:
the rainfall intensity is less than 3mm/h, and the deduction water consumption is 0 kg/m;
the rainfall intensity is 3-6 mm/h, and the water consumption is reduced by 1-2 kg/m;
the rainfall intensity is 7-10 mm/h, and the water consumption is reduced by 2-5 kg/m.
See the table below for detailed data.
| Rainfall intensity (mm/h) | VC value(s) | Water consumption of button (kg/m) |
| ﹤3 | 1 | 0 |
| 3~6 | 3 | 1~2 |
| 7~10 | 4 | 2~5 |
Finally, the inspection standard is that the rolling machine has the characteristic of slurry compaction after rolling.
As shown in fig. 12, the method is used for controlling the VC value of the field of the annual roller compacted concrete detected after construction in a certain project; in the engineering, the VC value of the mixture after unloading is required to be 0-5 s; according to the attached drawings, the actual data is 1.5-5.0, and the conditions are satisfied.
The method overcomes the influence of special climatic environments such as dry, hot, strong wind, large day and night temperature difference and the like on the VC value of the roller compacted concrete in northwest plateau areas, and summarizes the change rule, the optimal range value and the dynamic regulation and control technical measures of the VC value of the roller compacted concrete; different VC values are adopted according to different conditions to ensure the grindability of the roller compacted concrete, so that the strength and the impermeability of the roller compacted concrete are ensured, and experience is provided for dynamic control of the VC values of the roller compacted concrete under similar environmental conditions.
According to the method, aiming at a roller compacted concrete VC value detection test, data are arranged and analyzed, influences of air temperature, sunlight and rainfall are comprehensively considered, and a characteristic change curve of the VC value per month is summarized; after mastering the change rule of the VC value of the roller compacted concrete, controlling the VC value of the outlet through increasing and decreasing the mixing amount of the water reducing agent; the method has the advantages that the method adopts the modes of arranging rubber plastic sponge on the self-discharging vehicle roof for transporting concrete, arranging rubber plastic sponge on baffles on two sides of a vehicle body, wrapping rubber plastic sponge on a full-pipe chute pipe body, using U-shaped shielding shed on the upper part of a warehouse belt conveyor, spraying on the warehouse surface, reducing adverse effects caused by solar irradiation and strong wind, and ensuring that the VC value of the on-site roller compacted concrete still meets the requirements after the VC value of the roller compacted concrete is ensured to be lost in the transportation process.
According to the method, a proper VC value control interval is selected according to the influence of the climate conditions of the working condition area; and the machine outlet, the transportation and the warehouse surface are dynamically controlled, so that the VC value of the on-site roller compacted concrete is ensured to meet the requirement.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (2)
1. The construction method for dynamically controlling the VC value of roller compacted concrete under the condition of high-altitude complex environment is characterized by comprising the following steps:
s1, obtaining VC value data of environmental influence;
s2, dynamically controlling the VC value of the machine outlet;
s3, controlling VC value loss in transportation;
s4, the bin surface controls the VC value loss;
s5, controlling VC values under the weather effect;
acquiring the influence of the climate conditions of a working condition area, grasping corresponding data, and selecting a proper VC value control interval; dynamically controlling an outlet, a transportation process and a warehouse surface, and ensuring that the VC value of the on-site roller compacted concrete meets the requirement; providing a construction method for dynamic control of VC values for roller compacted concrete under complex environmental conditions;
specific:
in step S1, it includes:
s101, determining climate conditions of an engineering area;
installing a plurality of small weather stations in an engineering area, monitoring weather data every day, and recording weather conditions in time; the conditions of air temperature, wind speed, wind direction and rainfall are recorded in detail, and the typical climate conditions are determined by combining the local meteorological climate data;
s102, summarizing a change curve of VC values influenced by month natural environment;
the data are tidied and analyzed by using a chart tool according to a roller compacted concrete VC value detection test; comprehensively considering the influence of air temperature, sunlight and rainfall, and summarizing the characteristic change curve of the VC value per month;
s103, adjusting and controlling the VC value of the roller compacted concrete on the bin surface according to the temperature conditions of different time periods;
according to the roller compacted concrete VC value detection test, data are tidied and analyzed, and the influences of transportation, air temperature, strong wind and rainfall are comprehensively considered; measuring VC values under different time periods and air temperature conditions, comparing the VC values of the outlet of each month with the VC values after field unloading, and determining various influencing factors and related technical measures;
the VC value of the roller compacted concrete is controlled, and the VC value is regulated and controlled according to the temperature conditions of different time intervals every day;
under the conditions that the temperature is relatively low in the morning and at night, the humidity is high, and the VC value loss is low, the VC value of the warehouse surface roller compacted concrete is controlled to be 1S-2S; when the temperature of the noon air is high, the loss of the VC value of the bin surface is fast, and when the initial setting time is short, the VC value is controlled to be 0-1S;
in step S2:
under the condition that the mixing ratio of the roller compacted concrete is unchanged with other parameters, the VC value at the outlet of the machine is dynamically controlled by changing the mixing amount of the water reducing agent;
on-site mix VC value = machine outlet VC value + process loss VC value;
after the loss of the VC value in the process under different climatic conditions is analyzed, the VC value at the outlet of the machine is dynamically controlled by reducing or improving the mixing amount of the water reducing agent under the condition that the mixing ratio of the roller compacted concrete is unchanged compared with other parameters, so that the purposes of changing the VC value of the roller compacted concrete and controlling the VC value loss of the roller compacted concrete on site are achieved;
the VC value of the outlet is reduced by increasing the mixing amount of the water reducing agent in the high-temperature period; specifically, the mixing amount of the water reducer is increased or reduced according to the working condition, and the VC value is dynamically controlled;
under the condition of the same air temperature, the VC value of the roller compacted concrete is reduced, so that the setting time of the roller compacted concrete can be prolonged; wherein, every time the VC value is reduced by 1S, the initial setting time of the roller compacted concrete is correspondingly prolonged by about 20min;
when the air temperature is higher than 25 ℃, the mixing amount of the water reducer is properly increased, so that the initial setting time requirement of the high-temperature weather roller compacted concrete can be met; wherein, when the water reducer is increased by 0.1%, the VC value can be reduced by 0.8S, and the initial setting time is prolonged by about 30min;
in step S3:
a shielding shed is arranged on the roof of the transport dumper, and rubber-plastic sponge is arranged on baffles on two sides of a vehicle body;
the full-pipe chute pipe body is wrapped with rubber-plastic sponge, and a storage belt conveyor is provided with a shielding shed;
so as to reduce the adverse effect of solar irradiation and strong wind on the VC value of the roller compacted concrete; ensuring that the VC value of the on-site roller compacted concrete still meets the requirement after the VC value is lost in the transportation process;
in step S4:
the technical measure of forming microclimate by spraying the bin surface is adopted, so that the VC value loss during bin surface unloading and rolling is reduced;
wherein, the spray size is intelligently and dynamically adjusted according to the climate conditions;
a PVC spray pipe is arranged above the bin surface; the distance between the spray pipes is 5m and the distance between the spray pipes and the bin surface is 10m, and the single-pipe spray flow is controlled according to the air temperature condition; the rotary spray head is used, the temperature of the bin surface is reduced through the spray flow, and meanwhile, the solar radiation intensity can be reduced;
the specific spray flow operation is as follows:
temperature: [ 20, 23) ] DEG C, VC value: 0.7s, spray flow: 0.03m 3 /S；
Temperature: [ 23, 25) ] DEG C, VC value: 0.3s, spray flow: 0.05m 3 /S；
Temperature: not less than 25 ℃, VC value: 0.1s, spray flow: 0.07m 3 /S；
And the spraying machine position is determined according to the wind direction by adopting a movable spraying mode in windy weather.
2. The method for dynamically controlling the VC value of roller compacted concrete under high altitude complex environmental conditions according to claim 1, wherein in step S5:
the VC value of the roller compacted concrete is dynamically controlled by reducing the water consumption for mixing in rainy days;
wherein, the standard of mixing water consumption is reduced in rainy days, as follows:
intensity of rainfall<3mm/h, the water consumption is reduced by 0kg/m 3 ；
The rainfall intensity is 3-6 mm/h, and the water consumption is 1-2 kg/m 3 ；
The rainfall intensity is 7-10 mm/h, and the water consumption is 2-5 kg/m 3 。
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